Abstract: In a flowmeter system in which a fluid stream causes a ball to circulate in a guide track at a speed proportional to the volume flow rate of the stream, a signal is produced each time the ball passes a sensing point. The speed of the ball is continually measured, and from stored data representing the fluid volume passing through the flowmeter per signal as a function of the signal repetition rate, the volume associated with each signal is determined. The volumes thus determined during a given period are summed to give the total volume over the given period.